US3846035A - Reference beam grade control for asphalt pavers - Google Patents

Reference beam grade control for asphalt pavers Download PDF

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Publication number
US3846035A
US3846035A US00345115A US34511573A US3846035A US 3846035 A US3846035 A US 3846035A US 00345115 A US00345115 A US 00345115A US 34511573 A US34511573 A US 34511573A US 3846035 A US3846035 A US 3846035A
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United States
Prior art keywords
screed
tow
arm
grade
control system
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Expired - Lifetime
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US00345115A
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English (en)
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D Davin
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BLAW-KNOX CONSTRUCTION Corp
Blaw Knox Co
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Blaw Knox Construction Equipment Co
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Application filed by Blaw Knox Construction Equipment Co filed Critical Blaw Knox Construction Equipment Co
Priority to US00345115A priority Critical patent/US3846035A/en
Priority to CA194,109A priority patent/CA992781A/en
Priority to GB993874A priority patent/GB1463154A/en
Priority to DE2412781A priority patent/DE2412781A1/de
Priority to JP3161374A priority patent/JPS5440854B2/ja
Priority to FR7410159A priority patent/FR2223512B1/fr
Application granted granted Critical
Publication of US3846035A publication Critical patent/US3846035A/en
Assigned to BLAW-KNOX COMPANY reassignment BLAW-KNOX COMPANY MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 26, 1978. DELAWARE Assignors: AETNA-STANDARD ENGINEERING COMPANY, BLAW-KNOX CONSTRUCTION EQUIPMENT, INC.,, BLAW-KNOX EQUIPMENT, INC., BLAW-KNOX FOOD & CHEMICAL EQUIPMENT, INC., BLAW-KNOX FOUNDRY & MILL MACHINERY, INC., COPES-VULCAN, INC.
Assigned to BLAW-KNOX CONSTRUCTION CORPORATION reassignment BLAW-KNOX CONSTRUCTION CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WHITE CONSOLIDATED INDUSTRIES, INC., A DE CORP.
Anticipated expiration legal-status Critical
Assigned to BLAW-KNOX CONSTRUCTION EQUIPMENT CORPORATION reassignment BLAW-KNOX CONSTRUCTION EQUIPMENT CORPORATION CORRECTIVE ASSIGNMENT. Assignors: WHITE CONSOLIDATED INDUSTRIES, INC.
Expired - Lifetime legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C19/00—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving
    • E01C19/48—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ
    • E01C19/4866—Machines, tools or auxiliary devices for preparing or distributing paving materials, for working the placed materials, or for forming, consolidating, or finishing the paving for laying-down the materials and consolidating them, or finishing the surface, e.g. slip forms therefor, forming kerbs or gutters in a continuous operation in situ with solely non-vibratory or non-percussive pressing or smoothing means for consolidating or finishing
    • E01C19/4873—Apparatus designed for railless operation

Definitions

  • ABSTRACT The disclosure relates to an improved type of grade control for an asphalt paver utilizing reference members positioned in leading and trailing relation to the pavement-forming screed. Control over the grade of the asphalt mat laid down by a floating screed is controlled by the combined action of the reference members moving along with the paving apparatus and sensing the average grade conditions of the base in front of the screed as well as the average grade conditions of the newly laid pavement mat.
  • the new control provides for exceptional smoothness and uniformity of the pavement mat, and also greatly facilitates the use of mobile grade reference controls when laying extremely wide pavement mats.
  • a distributing auger which receives the raw asphalt material from the slat conveyor and conveys it laterally so as to distribute the material along the front edge of the screed.
  • the raw asphalt material flows under the screed, which levels, smooths and compacts it to provide a continuous, level pavement mat.
  • the screed is attached to a pair of forwardly extending tow arms which engage the paver frame at their forward extremities.
  • These tow arms are also connected to the paver frame by hydraulic or other actuators arranged to adjust the vertical position of the tow arm extremities in relation to the paver frame.
  • Effective control of the screed tow point adjustment may be achieved by means of suitable feeler device, for example, which is carried by one or both of the tow arms and arranged for contact with a predetermined reference surface.
  • suitable feeler device for example, which is carried by one or both of the tow arms and arranged for contact with a predetermined reference surface.
  • the tow point becomes either higher or lower than is indicated by the reference surface, as with changing loads upon paver frame and/or irregularities in the roadbed surface, the tow point is caused to be controllably raised or lowered relative to the paver frame to maintain a constant relationship with the reference.
  • grade control of the tow point is provided at only one side of the machine.
  • slope control which functions to maintain a constant relationship between tow points at opposite sides, either on a level basis or with a predetermined transverse slope.
  • the reference maybe the edge of previously laid pavement mat, in which case a simple shoe plate or the like is arranged to be towed along the pavement surface.
  • the individual supports are enabled to follow the minor deviations in base contour without significantly affecting the position of the reference beam as'a whole, and the mobile reference beam thus provides a suitably accurate, averaged reference plane representing the grade to which the pavement mat is to be applied.
  • a sensing device carried by the screed tow arms engages the reference beam near its center, to enable the tow points to be maintained in a predetermined relationship to the moving reference beam.
  • the utilization of a moving reference beam arrangement in connection with the laying of wide pavement mats is made feasible by the utilization of a unique combination of reference beams, one being towed ahead of the screed and auger, supported on the roadway base grade, and the other being towed behind the screed and auger, supported on the just-laid asphalt mat.
  • the arrangement of the invention includes a system of compound levers associated with the respective leading and trailing reference beams and arranged to derive a signal which is a function of the relationship of the screed and its tow arms to the respective reference beams. ln effect, the reference beam arrangement is of greatly increased length and enables the laying of a mat of increased smoothness and accuracy in comparison to prior arrangements.
  • the trailing reference beam which is towed by the paver frame behind the auger and screed is supported by one or more wheels or in some cases by an elongated flexible slide strip. Moreover, notwithstanding that the trailing reference beam rides upon the justdaid mat, it is desirable in many cases that the trailing reference beam be supported by a large plurality of wheels arranged for independent movement, such that the trailing reference reflects an averaged reference position. In the case of either the leading or trailing reference beams, or both, it is considered preferable to utilize a rigid beam with independently yieldably movable supports. However, it is within the purview of the invention to utilize reference beam structures comprising articulated pairs of supports (e.g., see DeLeuze, French Pat. No. 1,056,865).
  • the system of the invention includes leading and trailing reference beams of rigid structure, independently supported by a plurality of yieldable supports.
  • the leading reference beam is supported by a plurality of shoes or plates, while the trailing beam is supported by a plurality of wheels.
  • Elongated reference arms extend rearward from the leading beam and forward from the trailing beam and are pivotally connected to a screed tow arm, advantageously at a point forward of the screed itself but well behind the tow point.
  • the reference arm pivot point is in a position to reflect deviations from the reference level of both the tow point and the screed itself.
  • FIG. 3 is an enlarged elevational view, similar to FIG. I
  • FIG. 4 is a top plan view illustrating features of the trailing reference beam utilized in the apparatus of FIG. I, and showing reference beams utilized on both sides of the paving machine.
  • FIG. 5 is an enlarged, fragmentary elevational view illustrating details of the tow point suspension and reference signal means incorporated in the paving apparatus of FIG. 1.
  • the reference numeral designates generally a paver frame of a floating screed type asphalt paver.
  • the paver per se is well known in principle and includes an engine or prime mover 11 which provides a source of tractive power and also provides power for the various material conveying and distributing functions of the machine.
  • a pair of large, pneumatic tires 12 at the back of the paver provide the necessary forward traction, with steerage and support for the front of the paver being provided by pairs of smaller wheels 13.
  • a hopper 14 arranged to receive paving material, which may be aggregate, asphalt, and the like, from the tilted body of a truck (not shown).
  • paving material which may be aggregate, asphalt, and the like
  • the truck is brought into contact with the front of the paver, and then is pushed along by the paver, continuously discharging its contents into the hopper 14 during the progress of the paving operation, until the complete truckload is exhausted. Thereafter, the empty truck is replaced by a new, fully loaded truck, with the paving operation continuing from the hopper supply during the changeover interval.
  • the paving material is conveyed from the hopper 14 to the back of the machine and deposited in front of a controllably rotated auger 15.
  • the auger is pitched oppositely from the center, so as to convey the conveyordischarged paving material laterally outward and distribute it more or less evenly along the full length of the auger.
  • the basic body of the paver frame 10 may have an overall width of 10 or 12 feet, for example, to accommodate its over-the-road transportation from place to place.
  • the paver may be and often is set up in a configuration to lay paving mats in an uninterrupted width of 20 to as much as 40 feet on occasion. In such cases, the overall width of the auger 15 is substantially equal to the full paving width.
  • a strikeoff and screed structure Disposed immediately behind the auger 15 is a strikeoff and screed structure generally designated by the numeral '16, which is carried by a pair of forwardly extending tow arms 17.
  • the screed assembly 16 like the auger 15, has a width corresponding to the desired paving width, and thus may be substantially wider than the width of the paver frame 10.
  • the tow arms 17, are spaced so as to be closely adjacent to sides of the paver frame. Accordingly, the tow arm 17 may engage the screed assembly 16 well inboard of its lateral extremities. Intermediate portions 18 of the tow arms extend upward and over the top of the area occupied by the auger 15.
  • the tow arms 17 may be connected to the paver frame by means of spaced tow pins 19, 20 (FIG. 5) which are freely slidable on a vertically disposed tow bar 21.
  • An hydraulic actuator 22 is mounted at the upper end of the tow bar 21, and extends downward with its rod 23 engaging the forward portion of the tow arm 17.
  • the forward extremity of the tow arm may be appropriately raised or lowered in relation to the paver frame itself to effect desired adjustments in the angular attitude of the tow arms 17 and the screed assembly 16.
  • Similar arrangements are, of course, provided at both sides of the machine, with the respective actuators being separately controllable, however, to provide for independent manipulation of tow arm elevation on opposite sides of the machine.
  • a smooth, level mat 24 of paving material may be laid by the screed assembly 16 more or less independently of variations in the base roadbed 25 and also more or less independently of changes in the suspension of the paver frame itself resulting from changing loads in the hopper 14, for example, or movement of the wheels into or over minor discontinuities or obstructions in the roadway.
  • This is realized in part by providing a socalled grade reference level, which is independent of the paver frame 10, and by maintaining the tow point of at least one of the arms 17, at a predetermined height in relation to that reference.
  • the other tow arm likewise may be controlled by a similar reference means, although it is usually more common to control one of the arms from a grade reference extending longitudinally of the roadway while controlling the other tow arm by means of a so-called slope control. If the slope angle is zero, both tow arms will automatically be adjusted to maintain an equal uniform height in relation to a single grade reference. Frequently, however, a predetermined cross slope is built into the pavement surface, to facilitate drainage and/or for banking at turns. In the latter case, both tow arms can be adjusted in accordance with a single grade reference means, but the two tow arms will be maintained in an unequally spaced relation to that grade reference to provide the desired cross slope.
  • a suitable artificial grade reference frequently may be derived from the base roadbed itself, by means of an elongated reference beam individually supported by a large plurality of independently yieldable supporting elements.
  • the base road mat 25 may be a prepared but unpaved base, or
  • the present invention utilizes to a large extent some of the important principles of the beforementioned Davin patent, while at the same time providing a greatly improved mobile reference beam arrangement which is suitable for pavement configurations in which the screed and auger are of substantially greater overall width than the paver frame itself-and which, at the same time, provide for an exceptionally high degree of accuracy in the control of the level and smoothness of the resultant pavement mat.
  • the paving machine is provided with dual mobile reference beams 26,
  • each of the mobile reference beams is of highly extended length, possibly greater than the length of the paver itself.
  • at least the leading beam 26, and advantageously both beams are supported at a multiplicity of points along its length by equally spaced, independently movable supporting elements. The arrangement is such that the reference beam is supported in a positionwhich represents an average condition of the underlying surface over an extended length.
  • the function and operation of the forward or leading mobile reference beam 26 is in many ways similar to the mat, immediately behind the screed assembly 16.
  • reference data information from the respective beams 26, 27 is combined and made available to a sensing device 28 to effect controlled movement of the actuator 22 and thereby maintain a constant relationship between the screed assembly 16 and the respective leading and trailing reference beams 26, 27.
  • the moving reference beam 26 is in the form of a three-piece lightweight tubular beam joined at flanges 29 into a unitary assembly.
  • the segmented construction permits disman tling for transportation, as will be understood.
  • the leading reference beam 26 may have a length on the order of 30 feet and is supported at uniformly spaced intervals by a large plurality (10 in the illustration) of yieldably mounted shoes 30 (FIG. 2).
  • the shoes 30, may be made of flat sheet metal, pivotally connected at 31 to a yoke bracket 32 carried at the end of a guide bolt 33.
  • a stabilizing link 34 is pivotally connected to the yoke 32 and extends forward to a lug bracket 35, to which it is pivotally connected at 36.
  • the bolt 33 is slidably guided in a spherical bearing 37 received in a boss 38 formed on the reference beam 26.
  • a spring 38 extends between the spherical bearing 37 and the top of the yoke 32, and is arranged to be compressed as a function of upward movement of the shoe 30 relative to the reference beam 26.
  • the arrangement of the several supporting shoe assemblies for the leading reference beam is such that, when the beam is resting on the base surface 25, in its normal operating arrangement, the springs 38 of all of the shoe assemblies are partially compressed.
  • the base surface 25 may not be precisely level throughout the length of the reference beam, and may contain minor aberrations in the form of small rises or depressions, the beam itself and particularly its midpoint, will tend to maintain an averaged position above the roadway, reflecting the average condition of the surface.
  • individual shoe assemblies may rise or fall relative to the beam in following anomalies in the road surface.
  • the reference beam itself will be influenced only to a minor extent by individual movements of the shoe assemblies, but will reflect an average condition.
  • the geometric center of the beam in terms of the location of the supports therefor, reflects most precisely the average reference condition sought to be determined.
  • the geometric center of the beam is located near the forward extremity of one of the tow arms, and a sensing element is provided to detect the relationship between the forward portion of the tow arm and the geometric center area of the beam.
  • the leading reference beam 26 is to be located entirely forward of the auger 15, the geometric center region of an adequately long reference beam is located far ahead of even the forwardmost extremity of the tow arm 17.
  • the leading reference beam 26 is provided in its effective center region with a vertically extending bracket 39 which is pivotally connected at 40 to an elongated, rearwardly extending reference arm 41.
  • - reference arm 41 includes an upward extension 42 which is pivotally connected at 43 to the screed arm 17.
  • the pivot point 43 connecting the reference arm 41 to screed tow arm is located rearward of the tow bracket 21 and at the same time well forward of the screed assembly 16. A point approximately midway between these areas is advantageous, inasmuch as vertical movement relative to the desired reference of either the screed assembly I6 or its tow point will be reflected in vertical movement of the pivot point 43 and a corresponding vertical movement of the reference arm 41.
  • the reference beam 26 is carried along with the paver frame by means of a forward tow linkage 44, by which the beam is attached to the front of the paver.
  • An articulated stabilizing linkage 45 connects the back of the reference beam 26 to a portion 46 of the paver frame (FIG. 5) to provide lateral stability.
  • the trailing reference beam 27 typically may be somewhat shorter in length than the leading beam 26. For example, a beam length of feet for the trailing beam may be suitable, while a 30 foot length on the leading beam would be preferable.
  • the trailing beam is constructed in two sections, bolted together at a center flange 47.
  • the trailing reference beam 27 is supported by a large plurality of uniformly spaced sets of elements, there being eight such sets in the specific illustration. Under some conditions, a single support element might suffice for the rear reference, but a plurality is required and/or desired in most instances.
  • Wheels are used rather than flat shoe plates, as in the case of the leading reference beam, because the newly laid asphalt mat 24 is still in a soft condition when traversed. by the reference beam andcould be scraped or marred by individual sliding shoes.
  • the wheels 48 are arranged in pairs for increased flotation on the soft mat surface, and also to impart stability to the beam to facilitate its handling when detached from the paver.
  • the plurality of wheel pairs 48 for the trailing reference beam be independently supported, so that the position of the beam reflects an average position of the multiplicity of wheel pairs.
  • the wheel pairs may be supported much in the same manner as the shoes 36 of leading reference beam.
  • an axle 49 connecting the two wheels of a pair is journalled in a yoke bracket 50 carried at the end of a guide bolt 51 slidably received in a spherical bearing 52.
  • a coil spring 53 urges the yoke bracket 50 downward.
  • a stabilizing linkage 54 extends forward from the bracket and is pivotally connected to a fixed lug 55 extending downward from the bottom of the beam 27. The arrangement is such as to freely accommodate individual, yieldably resisted vertical movement of the wheel pairs relative to the rigid beam.
  • the trailing beam with non-rotating supports, like those of slide strip is suitably secured at its front end to the reference beam or to the paver itself, so as to be towed along with the beam.
  • the strip readily flexes to accommodate the desired independent movement of the beam supports.
  • the trailing beam advantageously is towed from the screed assembly 16, by means of a pivoted tow link 56 (FIG. 4) extending rearward from a bracket 57 suitably attached to the screed.
  • a diagonal stabilizing linkage consisting of a tie rod 58 secured to the beam by a clamp 59 and extending forwardly to a connection point at the opposite side of the machine.
  • the equipment is set up to employ reference beam systems on both sides of the paving machine.
  • the stabilizing bar 58 for the reference beam 27 may be secured by a clamp 60 to the forward portion of the opposite side trailing reference beam 270.
  • the beam 27a will be stabilized by a tie bar 58a secured by clamps 59a and 60a. Where only a single trailing reference beam is utilized, the stabilizing bar 58 can be connected more directly to the screed assembly 16.
  • a vertically disposed extension bracket 61 which pivotally engages at 62 the trailing end of a reference armstructure 63.
  • the reference arm structure 63 desirably is constructed in the form of a truss arranged to support an elongated, forwardly extending reference arm element 64.
  • the specific configuration of the truss 63 is unimportant, apart from the fact that it must be consistent with its passing over the top of the screed and auger structures at the back of the paver.
  • the reference arm 64 is attached by the pivot pin 43 to the forward reference arm 41 and to the screed tow arm 17.
  • the forward and rearward reference arms 41, 64 could be separately pivoted to the tow arms 17, or they could be pivotally connected together and pivoted to the tow arm 17 at a different axis.
  • a common pivot point at the pin 43 is simple and advantageous.
  • the rearward reference arm 64 extends forwardly well beyond the pivot pin 43, to a region located approximately over the center of the forward reference arm 41.
  • the sensing device 28 typically in the form of a potentiometer actuated by a feeler element 65, is secured to the upper reference arm 64, by means of a clamping bracket 66.
  • the bracket 66 may be secured in any of several positions along the length of reference arm 64, so as to be properly positioned with respect to the forward reference arm 41.
  • the sensing device 28 has a vertically extendable support 67 adjustably secured in the clamp 66. As reflected in FIG.
  • the sensing device 28 may be vertically adjusted in the clamp 66 to a position in which the feeler element bears upon the center region of the forward reference arm 41.
  • the feeler element 65 When properly adjusted, the feeler element 65 will be approximately midway between its upper and lower extreme positions when the proper space relationship exists between the respective reference arms 41, 64. Any change in the spacing between these arms, in the region of the sensor 28, will cause a displacement of the feeler 65, either upward or downward.
  • movement of the potentiometer feeler element 65 away from its neutral position can be utilized to effect energization of the actuator 22 in a direction that will tend to restore the feeler to its neutral position by appropriate upward or downward movement of the tow arm 17, as may be necessary.
  • the reference arms 41, 64 are arranged to be more or less horizontal and parallel when the respective leading and trailing reference beams are in a desired, predetermined relationship and the tow arms 17 are properly positioned.
  • the vertical supports 39, 61 may be provided with a plurality of openings or other adjustment facilities for establishing a desired level for the pivot points 40, 62 of the respective reference arms.
  • the paver frame advances forwardly (to the left in FIG. 1) carrying with it the reference beams 26, 27, the former riding on the roadway base surface and the latter riding on the just laid pavement mat.
  • the forward extremity of the tow arm 17, being attached to the paver frame through the hydraulic actuator 22 would be correspondingly lowered relative to the reference beams 26, 27. This would in turn cause a lowering of the pivot point 43 and a resulting relative closing of the distance between the reference arms 41, 64 in the region of the sensor 28.
  • the actuator 22 would be energized to raise the forward end of the tow arm 17 suffiv ciently to re-establish proper spacing between the reference arms.
  • the orientation of the tow arms 17 to the roadway base surface 25 and to the pavement surface 24 is retained substantially constant, notwithstanding vertical deviations of the paver frame itself.
  • the screed assembly 16 is supported by flotation on the viscous asphalt paving material as the paver is advanced on the roadway.
  • the viscosity and other characteristic nature of this material ideally should be constant at all times.
  • the consistency of the mixture may vary from truckload to truck load, and the viscosity characteristic of even the same mixture may vary somewhat as a function of temperature, for example. Accordingly, assuming the paving frame 10 itself is traveling a perfectly level course, there may be some tendency for the screed assembly 16 to deviate upward or downward in some measure from the desired paving level. When this occurs, it is reflected in upward or downward movement of the pivot point 43 and a corresponding change in the relationship of the reference arms 41, 64.
  • the pivot point 43 would be correspondingly lowered, and the distance between the reference arms and the region of the sensor 28 would be correspondingly reduced.
  • the potentiometer feeler 65 would be displaced from its neutral position, energizing the actuator 22 and raising the forward extremity of the tow bar 17 to re-establish the proper spacing.
  • the dual reference beam system of the invention results in an exceptionally high degree of accuracy and smoothness in the laying of an asphalt paving mat, because the level of the screed .plate is controlled as a combined function of the roadway base surface 25 and the just-laid pavement surface 24. Moreover, the extreme overall length of the dual reference beam system provides for exceptional overall responsiveness of the control to deviations from a desired level surface.
  • system of the invention provides a rather simplified and wholly practical arrangement for utilizing a mobile reference means in conjunction with heavy duty asphalt pavers having the capacity to lay a pavement mat of far greater width than that of the paver frame itself. This is of particular importance in view of current trends toward the paving of 30 and 40 foot mat widths in a single pass with the paving machine.
  • the trailing reference beam although riding on an essentially smooth and level, just-laid pavement surface, is supported by a large plurality of elements, preferably wheels, each being independently supported.
  • wheels can, in continued operation, become rather irregular through non-uniform pickup of adherent asphalt material.
  • the trailing reference beam can be supported in an appropriately averaged position notwithstanding a degree of out-of-roundness of the individual wheels during normal operations.
  • a dual reference beam grade control system for i use in combination with an asphalt paver of the type having a transversely disposed material distributing auger, a floating screed positioned behind the auger, tow
  • said grade control system comprismg a. a beam-like first reference member towed by the paver frame and extending longitudinally along one side thereof,
  • a first reference arm pivotally connected to the first reference member in its central region and extending rearwardly toward and being pivotally connected to one tow arm
  • a second reference arm connected to the second reference member and extending forwardly toward and being pivotally connected to said one tow arm and/or said first reference arm
  • tow arm height reference control means associated with each of said reference arms and operatively associated with said tow arm suspension means for raising and lowering the tow point of said one tow arm relative to the paver frame in response to relative movements of one or both of said reference arms in relation to said one tow arm.
  • grade control system of claim 1 further characterized by a. said reference control means including means engaging both of said reference arms and operative to detect relative movement therebetween.
  • control means including a sensing potentiometer or the like carried by one of said reference arms and engageable with the other to detect rela tive movement.
  • one of said reference arms having a portion extending longitudinally for a substantial distance beyond its pivot axis in the direction of the other reference arm
  • said reference control means being operatively associated between the extending portion of said one reference arm and a portion of said other reference arm.
  • grade control system of claim 4 further characterized by a. said second reference arm having a portion extending longitudinally forward of said axis.
  • grade control system of claim 5 further characterized by a. said reference arms being connected to said one tow arm along a common pivot axis.
  • grade control system of claim 6 further characterized by a. said pivot axis being located on said one tow arm between the tow point and the screed and closer to the screed than the tow point.
  • grade control system of claim 1 further characterized by a. said first reference member being towed from the paver frame from a point substantially forward of the back end of the member,
  • stabilizing linkage means being connected between the paver frame and the back portion of the first reference member
  • stabilizing linkage means being connected to the back portion of the second reference member and extending diagonally forwardly and toward the opposite side of the back portion of the paver frame.
  • grade control system of claim 14 further characterized by a. the combination comprising dual reference member grade control systems at each side of the paver frame for separately controlling the tow point positions of the respective tow arms, and
  • the diagonally disposed stabilizing linkage means extending from the back portion of one of the second reference members to the forward portion of the other thereof.
  • a reference beam grade control system for use in combination with an asphalt paver of the type having a transversely disposed floating screed towed behind a paver frame and screed control means for maintaining a predetermined relationship of the screed to a reference, which comprises a. a plurality of about six or more supporting wheels,

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Machines (AREA)
US00345115A 1973-03-26 1973-03-26 Reference beam grade control for asphalt pavers Expired - Lifetime US3846035A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
US00345115A US3846035A (en) 1973-03-26 1973-03-26 Reference beam grade control for asphalt pavers
CA194,109A CA992781A (en) 1973-03-26 1974-03-05 Reference beam grade control for asphalt pavers
GB993874A GB1463154A (en) 1973-03-26 1974-03-05 Reference beam grade control for asphalt pavers
DE2412781A DE2412781A1 (de) 1973-03-26 1974-03-16 Niveaureguliersystem fuer eine asphaltiermaschine
JP3161374A JPS5440854B2 (ja) 1973-03-26 1974-03-22
FR7410159A FR2223512B1 (ja) 1973-03-26 1974-03-25

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US00345115A US3846035A (en) 1973-03-26 1973-03-26 Reference beam grade control for asphalt pavers

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US3846035A true US3846035A (en) 1974-11-05

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US00345115A Expired - Lifetime US3846035A (en) 1973-03-26 1973-03-26 Reference beam grade control for asphalt pavers

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US (1) US3846035A (ja)
JP (1) JPS5440854B2 (ja)
CA (1) CA992781A (ja)
DE (1) DE2412781A1 (ja)
FR (1) FR2223512B1 (ja)
GB (1) GB1463154A (ja)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4140420A (en) * 1978-03-16 1979-02-20 Cmi Corporation Portable grade averaging apparatus
US4213719A (en) * 1978-09-28 1980-07-22 Cmi Corporation Grade averaging apparatus
US4270801A (en) * 1979-08-14 1981-06-02 Cmi Corporation Steering and cutter drum positioning in a paved roadway planing machine
US4580923A (en) * 1984-08-15 1986-04-08 Ingersoll-Rand Company Actuating means for a servo valve
WO1992020870A1 (en) * 1991-05-17 1992-11-26 Caterpillar Paving Products Inc. Tow point for an asphalt paver
US5344254A (en) * 1993-04-14 1994-09-06 Blaw-Knox Construction Equipment Corporation Pivoting screed edger
US5362177A (en) * 1993-02-16 1994-11-08 Blaw-Knox Construction Equipment Corporation Paving method and apparatus with fresh mat profiler
US5549412A (en) * 1995-05-24 1996-08-27 Blaw-Knox Construction Equipment Corporation Position referencing, measuring and paving method and apparatus for a profiler and paver
US5599134A (en) * 1995-09-15 1997-02-04 Cedarapids, Inc. Asphalt paver with compaction compensating system
US5752783A (en) * 1996-02-20 1998-05-19 Blaw-Knox Construction Equipment Corporation Paver with radar screed control
US20200048843A1 (en) * 2016-10-07 2020-02-13 Anthony Kelly A compaction compensation system

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JPS547020U (ja) * 1977-06-18 1979-01-18
JPS596451U (ja) * 1982-07-05 1984-01-17 セイレイ工業株式会社 脱穀機における排塵調節装置
JPS61234714A (ja) * 1986-04-11 1986-10-20 ヤンマー農機株式会社 脱穀機の作動制御装置
CN102720117B (zh) * 2012-06-27 2015-01-07 中联重科股份有限公司 熨平板和摊铺机
US10633805B2 (en) * 2018-03-30 2020-04-28 Caterpillar Trimble Control Technologies Llc Grade and slope lockout for extender movement of construction machine

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US2962979A (en) * 1959-05-21 1960-12-06 William C Mccormick Method of correcting existing track and alignements and means for practicing it
US3272099A (en) * 1963-01-31 1966-09-13 Frank M Drake Stringline attachment for paving machine
US3259034A (en) * 1963-04-15 1966-07-05 Blaw Knox Co Reference plane for paving machines
US3323427A (en) * 1966-06-06 1967-06-06 Iowa Mfg Co Cedar Rapids Traveling string-line for bituminous pavers
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Cited By (14)

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US4140420A (en) * 1978-03-16 1979-02-20 Cmi Corporation Portable grade averaging apparatus
US4213719A (en) * 1978-09-28 1980-07-22 Cmi Corporation Grade averaging apparatus
US4270801A (en) * 1979-08-14 1981-06-02 Cmi Corporation Steering and cutter drum positioning in a paved roadway planing machine
US4580923A (en) * 1984-08-15 1986-04-08 Ingersoll-Rand Company Actuating means for a servo valve
WO1992020870A1 (en) * 1991-05-17 1992-11-26 Caterpillar Paving Products Inc. Tow point for an asphalt paver
US5201603A (en) * 1991-05-17 1993-04-13 Caterpillar Paving Products Inc. Tow point for an asphalt paver
US5362177A (en) * 1993-02-16 1994-11-08 Blaw-Knox Construction Equipment Corporation Paving method and apparatus with fresh mat profiler
US5344254A (en) * 1993-04-14 1994-09-06 Blaw-Knox Construction Equipment Corporation Pivoting screed edger
US5549412A (en) * 1995-05-24 1996-08-27 Blaw-Knox Construction Equipment Corporation Position referencing, measuring and paving method and apparatus for a profiler and paver
US5599134A (en) * 1995-09-15 1997-02-04 Cedarapids, Inc. Asphalt paver with compaction compensating system
US5702201A (en) * 1995-09-15 1997-12-30 Cedarapids, Inc. Method for compensating differential compaction in an asphalt paving mat
US5752783A (en) * 1996-02-20 1998-05-19 Blaw-Knox Construction Equipment Corporation Paver with radar screed control
US20200048843A1 (en) * 2016-10-07 2020-02-13 Anthony Kelly A compaction compensation system
US11220793B2 (en) * 2016-10-07 2022-01-11 Anthony Kelly Compaction compensation system

Also Published As

Publication number Publication date
FR2223512A1 (ja) 1974-10-25
CA992781A (en) 1976-07-13
DE2412781C2 (ja) 1987-02-19
JPS49127436A (ja) 1974-12-06
DE2412781A1 (de) 1974-10-17
GB1463154A (en) 1977-02-02
FR2223512B1 (ja) 1978-06-02
JPS5440854B2 (ja) 1979-12-05

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